In:
Journal of Geophysical Research: Atmospheres, American Geophysical Union (AGU), Vol. 106, No. D10 ( 2001-05-27), p. 10403-10410
Abstract:
Nitrous oxide (N 2 O) extracted from stratospheric whole air samples has been analyzed for its 15 N and 18 O isotopic composition, and strong enrichments in the heavy isotopes are observed concomitant with decreasing N 2 O mixing ratio. Notably, the 15 N enrichment is strongly different at the two nonequivalent positions in the molecule. Laboratory broadband photolysis experiments at wavelengths representative for the stratosphere confirm that photolysis is the prime cause for the observed fractionation in the stratosphere. However, the in situ stratospheric fractionation constants are significantly reduced compared to the laboratory data, reflecting the importance of dynamic processes. In addition, small but significant variations in the ratio of the two 15 N fractionation constants indicate the influence of additional chemical processes like the oxidation of N 2 O by O( 1 D ).
Type of Medium:
Online Resource
ISSN:
0148-0227
DOI:
10.1029/2000JD900822
Language:
English
Publisher:
American Geophysical Union (AGU)
Publication Date:
2001
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